Nickelmolybdenum based electrolcatalysts were synthesized in organic media for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media. The strutture, morphology, and chemical composition of the catalysts were evaluated by XRD, SEM and AAS. Results revealed nanocristalline powder materials with Ni0.006Mo, Ni0.1Mo, and NiMo compositions. The best performance for HER, was obtained on Ni0.1Mo electrode, whereas NiMo was for the OER. Results suggest that the material with 1: 1 stoichiometric ratio could be considered as a promising electrocatalyst for OER. This nanotrystalline powder is formed by Ni2Mo3O8 and a crystalline structure attributed to the possible formation of a NiMo cluster, becomes NiMoO4 after thermal treatment at 1073K in air. The NiMo 1:1 cluster catalyst presented electrochemical stability during the OER.

The authors thank Letitia Carapia for is aide with the RDX patterns, S Citalán for the electrochemical measurements of the thermally treated NiMo. This work is part of the ININ projetc of materials for hydrogen production and storage.